Friction-clutch



(No Mode l.) 2' Sheets-Sheet 2.

T. O. KENNEY. FRICTION GLUTGH.

N0. 419,958. Patented Jan.21, 1890.

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FRICTION -CLUTCH.

SPECIFICATION forming part of Letters Patent No. 419,958, dated January21, 1890. Application filed November 6, 1889. Serial No. 329,402. (Nomodel.)

To all whom it may concern.-

Be it known that I, THEODORE O. KENNEY, a citizen of the United States,residing at Scottdale, in the county of Westmoreland and State ofPennsylvania, have invented certain new and useful Improvements inFriction- Clutches, of which the following is a specification, referencebeing had therein to the accompanying drawings, in which- Figure 1represents a vertical sectional view of the improved clutch mechanismapplied to a winding or hoistingdrum; Fig. 2, an end view of the same,and Fig. 3 a view of theopposite end of the drum.

This invention has relation to certain new and useful improvements uponthat class of friction clutches employed on hoisting or winding drumswherein are used two or more clutch or friction bands, which areoperated at the will of the operator, to cause the drum to revolve withthe main shaft, as will more fully hereinafter appear.

The essential object of this invention is to improve and simplify thegeneral construction of this class of clutches, whereby the best resultsare obtained and the wear upon the parts reduced to a minimum, as willpresently appear. y

In the drawings, a designates the main shaft, which may be geared withand operated by any suitable mechanism Loosely journaled upon this shaftis a windingdrum b, which is preferably constructed of two cast sectionsbolted together at the point where their inwardly-projecting hubs 0meet, as shown in Fig. 1. To prevent'undue wear of the winding-drum, thehub of the same is slightly enlarged at its ends to receive wearing-sleeves d of some lrard metal, these sleeves serving to prevent thedrum proper from co1n-= ing in contact with the shaft. Keyed rigidly tothe shaft in close proximity to one end of the drum is a friction-wheelc. J ournaled in the drum at diametrically-opposite points and outsideof the periphery of the friction-wheel are two rock-shafts f, whichextend from one end of the drum to the other, and on their ends nearerthe friction wheel are provided with inwardly-directed orank-arms Theinner ends of these arms are pivotally connected to semicircularfriction-bands h, pro vided with renewable wearing-surfaces and adaptedto impinge against the periphery of the friction-wheel when the clutchis applied. The other ends of these bands are pivotally connected toscrews h, tapped in lugs 73, secured to the adjacent ends of the drum.By means of these screws it will be observed that the bands may bereadily adjusted with respect to the periphery of the band-wheel tocompensate for wear, jam-nuts jj being provided upon opposite sides ofthe lug for the purpose of holding the screws in their adjustedpositions. The hub of the drum opextension 0, upon which is placed asliding ring 70, provided with a peripheral groove for the reception ofa band 7a which latter is provided with oppositely-projecting pins Z forthe attachment of a suitable forked operating-lever. Pivotally connectedto the ring at diametrically opposite points are the pivotal links m,pivotally connected at their outer ends to radially-arrangedreciprocating rods '21, which latter are adapted to slide in two partboxes 0, removably bolted to the adjacent end of the drum. These boxes 0are to cars 19, formed integral with the radial arms or spokes of thedrum. The outer ends of the rods 02 are slotted for the reception of therounded ends of crank-arms g, keyed upon the projecting ends of therock-shaft.

It occasionally becomes necessary to revolve the drum and shaft in theopposite direction to that for which it is adapt-ed when it leaves theshop. In order that the friction-bands will properly grip thefriction-wheel when the direction of rotation of the drum is thusreversed, it is necessary to shift the crank-arms g on the rock-shaftsto points about diametrically opposite to that which they occupy in thedrawings, which may be done by removing their secui'ingkeys. In orderthat the boxes 0 and rods 11, may be shifted over in lines with the endsof the crank-arms, I form on the spokes of the drum a duplicate set ofperforated ears p for the securing-bolts of the plates 19, as shown inFig. 2.

When it is desired to cause the drum to rotate with the shaft, thesliding ring 70 is moved against the end of the drum, whereupon the rodsn will be forced out in a radial direction, simultaneouslyrocking theshafts f in posite the friction-wheel is provided with an bolted toplates 19, which are in turn bolted opposite directions and drawing thefrictionbands forcibly against the periphery of the friction-Wheel.

A very important feature of this invention consists in mounting all themechanism, eX- cept the friction-wheel, upon the drum, whereby when thedrum is at a standstill there will be absolutely no Wear upon either thering 10 or its band is, rendering the whole.ap-. paratus more durableand practical. This advantage is of great importance, inasmuch as theshaft is kept revolving continuously in this class of hoisting-machines,while the drum is at a standstill the greater part of the time. Evenwhen the drum is revolving the contactingesurfaces between the ring isand its band k are the only parts that will be subjected to a wearingaction.

A serious defect in this class of machines has been that the ring andband soon become so worn as to require renewal; but my arrangementremedies this defect and produces a device that is eminently practicalin all respects.

Having thus fully described my invention,

what I claim, and desire to secure, is

1. The combination, with the shaft and friction-wheel secured thereto,of the drum mountthe two rock-shafts journaled in the drum at pointsoutside of the periphery of the said friction-wheel, these shafts beingprovided with crank-arms upon both ends, frictionbands pivotallyconnected at one of their ends to the crank-arms on the rock-shaft andat their other ends to the friction-drum, and rods and links connectingthe crank-arms on the other ends of the rockrshaft to the sliding ring,substantially as and for the purpose described.

2. The combination, with the shaft and frie tion-Wheel secured thereto,of the looselymounted drum provided with an extension 0 at one end, asliding ring upon this extension,

a strap in a peripheral groove in this ring,

friction-bands, and means for connecting the friction-bands to thesliding ring, substantially as and for the purpose described.

In testimony whereof I aflix my signature in presence of two witnesses.

THEODORE G. KENNEY. WVitnesses:

H. B. FRANoIs, JOHN RUTHERFORD.

